Runecrafting Cape
Runecrafting Cape is the mastery cape of Runecrafting: only those who took that profession to level 100 wear it.
How to get it
Take Runecrafting to level 100 and talk to Mother Ilse, seer: they give you the quest Mastery: Runecrafting, and turning it in grants the cape. It is the only way to get it.
Who can use it
Any class can equip it.